Year	Number
1996	23.4042549133301
1998	36.7021293640137
2000	17.4603176116943
2002	26.4550266265869
2003	27.6381912231445
2004	22.3300971984863
2005	20.3883495330811
2006	22.2222213745117
2007	29.468599319458
2008	23.0769233703613
2009	15.6398105621338
2010	21.3270149230957
2011	30.8056869506836
2012	36.9668235778809
2013	35.0710906982422
2014	29.0476188659668
2015	22.380952835083
2016	23.3333339691162
2017	22.8571434020996
2018	19.3396224975586
2019	19.8113212585449
2020	20.7547168731689
2021	24.5283012390137
2022	13.2075471878052